What's with all this hopeful wishes that Marguerite will become Luffy's wife, anyway? In fact, Oda neatly sidestepped the issue of romance in the manga by saying that "they are in love with adventure" — throughout the entire series, not one hint of romance was shown. Also, it's is currently uncertain whether Marguerite will even join the Straw Hats. That rumor was started by a mistranslation of 514's spoiler, or more likely, the spoiler provider's wishful thinking that she will join. However, it is still quite possible, as it was foreshadowed since early in the series that Luffy wanted a crew of ten (not sure whether he counts himself, though). I'm going to hold off on my judgement, though, until I learn more about her.